×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Jobs

Welding 321 SS tubing to P22 Sch 40 Pipe

Welding 321 SS tubing to P22 Sch 40 Pipe

Welding 321 SS tubing to P22 Sch 40 Pipe

(OP)
I am looking for some information on WPS requirements for welding 321 Stainless to P22 pipe. The information is below:

Process conditions

Plant life: 30 years
Temperature cycles once every day, constant pressure
Max temp: 750 deg F
Min temp: 180 deg F
Pressure:  230 psi

Materials

Pipe spool: P22 schedule 40 piping with a beveled end, beveled down to .079" thickness
Tubing: 321 SS, 2.5" diameter, square land, .087" thick
Pipe: Carbon Steel schedule 40 piping with a beveled end, beveled down to a .079" thickness

I need procedures to weld:

-Pipe spool to tubing
-Tubing to tubing
-Tubing to Pipe


With this information can anyone tell me what is needed. I would like to do a bi metal PQR if at all possible to keep the costs down.

Any info would help.

T. Dowd
CWI
NDT Level II - MT, PT, UT, RT, VT
ICC Certified
Nuclear Leaad Auditor Trained

RE: Welding 321 SS tubing to P22 Sch 40 Pipe

Recommend welding filler metal to be ERNiCr-3 or similar. Preheat @ 300 F.  

RE: Welding 321 SS tubing to P22 Sch 40 Pipe

You might look at ER309L, to save a little money over ERNiCr-3.  And it welds 'easier'.

RE: Welding 321 SS tubing to P22 Sch 40 Pipe

Dewe6,
The daily temperature cycles would limit the thermal fatigue life using ER309L vs a Nickel base filler.

RE: Welding 321 SS tubing to P22 Sch 40 Pipe

What welding code or standard are you welding to?

The CWI credential alone does not qualify an individual to develop a WPS. If you are on unfamiliar ground, consult with a professional that is expereinced in developing WPSs and one that is familiar with the materials your are working with.

Your starting point should be a review of the applicable welding standards. In this case I suspect ASME Section IX and either B31.1 or B31.3 would be applicable.  

Best regards - Al  

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources